I don't own a GS2 myself, so I can't give U specific instructions on how to enter codes, but U just need to enter the 2 lines of code for the CLK, just as I have written them, as 1 code, and call it CLK or CLK Touring. Do the same for the viper, make sure the codes are activated, and start the game. U should be able to buy both for zero credits at their dealers.